;(function (doc, win) {
  console.log(doc)
  var docEl = doc.documentElement
  var resizeEvt = "orientationchange" in window ? "orientationchange" : "resize"
  let recalc = function () {
    var clientWidth = docEl.clientWidth
    console.log(clientWidth)
    if (!clientWidth) return
    if (clientWidth >= 750) {
      docEl.style.fontSize = "100px"
    } else {
      docEl.style.fontSize = 100 * (clientWidth / 750) + "px"
    }
  }
  if (!doc.addEventListener) return
  win.addEventListener(resizeEvt, recalc, false)
  doc.addEventListener("DOMContentLoaded", recalc, false)
})(document, window)
